You can now setup your treasure chests to spawn on the surface of your world, above ground. You can do this by setting a minimum and maximum depth of 0.
Tweaks:
Added configuration feedback to treasure-radius, treasure-min-depth, treasure-max-depth and treasure-max-offset, so you can't set it up with invalid values anymore.
Changed the calculations of the random depth and location as well as the estimated depth and location to be more accurate and efficient.
Bug Fix:
Fixed a bug where (small) values in the random treasure offset and depth's could cause errors when spawning a treasure chest.